具奈米多孔性陽極氧化鋁之軟性液晶顯示結構振動與熱應力分析

Thermal Stress and Vibration Analysis of Flexible LCD Structure with Nanoporous AAO Thin Film

宋法欣

指導教授 ： 葉孟考

國立清華大學/工學院/動力機械工程學系/碩士(2012年)

摘要

本研究著重於具有奈米多孔性陽極氧化鋁之可撓性液晶顯示裝置，首先利用有限單元分析方法，以有限單元軟體ANSYS®得到奈米多孔性陽極氧化鋁隨孔隙率變化之機械性質及熱傳導與熱膨脹係數，接著研究具有奈米多孔性陽極氧化鋁之可撓性液晶顯示器結構，探討製備疊層薄板時的陽極氧化溫度對結構內熱應力與熱變形所造成的影響，以求出最適合進行製備結構之製程溫度。最後則針對液晶顯示器整體於運作時之熱應力與熱變形進行分析，並找尋顯示器結構之共振頻率與共振模態。在實驗部分，本研究進行紅外線熱像儀溫度量測實驗與振動量測實驗。紅外線熱像儀量測試片於加熱時表面溫度場分佈，對液晶顯示器運作時結構之溫度分佈進行驗證，而振動量測以雷射都卜勒振動量測儀對受到激振之試片進行量測並與模擬結果比對，以確保顯示器之共振頻率與共振模態分析之正確性。根據研究結果，在較低的溫度（5 ℃）進行陽極氧化反應，氧化鋁的製備較為順利且顯示器運作時具有較小熱應力，顯示器結構前五共振模態之頻率則落在63.35 Hz至117.04 Hz間。藉由以上分析與實驗，本研究可對可撓性液晶顯示器之研究提供可靠度的分析與設計上的參考。

關鍵字

軟性液晶顯示器 ； 奈米多孔性陽極氧化鋁 ； 熱應力 ； 熱應變 ； 自然頻率 ； 共振模態

並列摘要

This study focus on the flexible LCD device with nanoporous anodic aluminum oxide. The finite element software ANSYS ® was used to obtain the mechanical properties, thermal conductivity and thermal expansion coefficient of the nanoporous anodic aluminum oxide. In order to find the most suitable process temperature for the preparation of the LCD structure, the thermal stress and the thermal deformation of the LCD structure during manufacturing process and in operation were discussed, and the resonance frequency and the resonance modes of the display structure were also obtained. In the experiment, the infrared temperature measurement experiment and vibration measurement experiment were performed in this study. The results showed that the best temperature at the process is 5 ℃ and the 1st ~5th resonance frequency of resonance modes are between 63.35 Hz and 117.04 Hz. By the analysis and experimental mentioned above, we expect this study can provide some references for the analysis and the reliability design in flexible LCD.

參考文獻

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